D.L.
Our family has been learning at home and in the world for 6 years. My home educated sons are 15 and 11. I was unaware that the Santa Clara Unified District had an independent study program.
The programs associated with the public schools that I know about currently are offered through the Mountain View school district, Ocean Grove charter school, and CAVA. I believe there is also a program in southern San Jose, but I couldn't tell you who offers that program. You can also establish a private school in your home and inform the state that you have done so by filing the private school affidavit. You can find more information on the legalities of home education through one of the state organizations, HSC, CHN or (if you are Christian faith based) CHEA.
It sounds like your son is what some call "twice gifted". You may want to check out giftedhomeschoolers.org . There are great lists of park/support groups in the area listed both at homefires.com and A to Z Home's Cool Homeschooling. You may also wish to join the Yahoo group for area field trips, BAHFT.
About me: I'm a mom of 4. My grown son and daughter (now 31 and 27) attended traditional schools. My younger sons, ages 11 and 15 are secular relaxed eclectic learners. I'm wondering if we can truly call my youngest child home educated - between archery, a multitude of science classes, cooking, First Lego League, math enrichment, ice skating, drums, Java programming, etc., we're never home!